<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>3_虚拟DOM和真实DOM</title>
</head>
<body>
  <!-- 准备好一个"容器" -->
  <div id="test"></div>
  <div id="demo"></div>

  <!-- 引入react核心库 -->
  <script type="text/javascript" src="../js/react.development.js"></script>
  <!-- 引入react-dom,用于支持react操作DOM -->
  <script type="text/javascript" src="../js/react-dom.development.js"></script>
  <!-- 引入babel, 用于将jsx转为js -->
  <script type="text/javascript" src="../js/babel.min.js"></script>


  <script type="text/babel">/* 此处一定要写babel*/
    // 1.创建虚拟DOM
    const VDOM = React.createElement('h1', {id:'title'},React.createElement('span', {}, 'Hello,React'))
    // 2.渲染虚拟DOM到页面
    ReactDOM.render(VDOM, document.getElementById('test'))
    console.log('虚拟DOM', VDOM)
    
    const TDOM = document.getElementById('demo')
    console.log('真实DOM', TDOM)
    debugger;
    // console.log(typeof VDOM)
    // console.log(VDOM instanceof Object)
    /*
        关于虚拟DOM
        1.本质是Object模型的对象(一般对象)
        2.虚拟DOM比较轻,真实DOM比较重,因为虚拟DOM是React内部在用,无需真实DOM上那么多的属性
        3.虚拟DOM最终会被React转化为真实DOM，呈现在页面上
    */
  </script> 
</body>
</html>